218 MOEPHOLOGY AND EVOLUTION elongated, and a vertical partition marks off the pyloric antrum from the rest of the stomach; but the antrum communicates with the body of the stomach below it, Sandifort and Fick have described this arrangement. The vascular and nerve supply are as in the Chimpanzee. Many observers have pointed out that the stomach in the Gibbons is more globular than in Man; and it is raore elongated than in the Gorilla. The interior shows nothing peculiar. The general relations of the stomach in the Anthropoid Apes are much as in Man. A large body of literature dealing with the structure of the intestinal tract exists, but little has been written about the chemistry of digestion in the Apes. The only details which I have been able to trace are Wells's (413) articles on the purine enzymes. From the character of the diet there must be differences between the enzymes in Man and those in the Anthropoid Apes. The Intestinal Tract. In the Chimpanzee the duodenumbegins opposite the first lumbar vertebra, and it is throughout entirely behind the peritoneum. It is divided as in Man into horizontal, descending and ascending parts which measure 14, 2, and 2i in. long respectively. There is a well-marked duodeno-jejunal flexure at the level of the first lumbar vertebra. The common bile-duct and pancreatic ducts have a common opening in the descending part, but there is no papilla. No valvulse conniventes are present, and the villi are small.